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Trade Accounts Payable and Accrued Expenses
 12 Months Ended
Dec. 31, 2011
Payables and Accruals [Abstract]  
Trade Accounts Payable and Accrued Expenses
6. Trade Accounts Payable and Accrued Expenses
 
Trade accounts payable and accrued expenses consist of the following:
 
December 31,
  
2011
    
2010
  
Trade accounts payable
 $ 12,263 $ 6,597
Accrued expenses
     16,329       9,895  
    $ 28,592     $ 16,492